WO2009145435A1 - Dispositif upnp permettant d'empêcher un conflit d'adresses réseau en cas d'accès à distance et procédé correspondant - Google Patents

Dispositif upnp permettant d'empêcher un conflit d'adresses réseau en cas d'accès à distance et procédé correspondant Download PDF

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Publication number
WO2009145435A1
WO2009145435A1 PCT/KR2009/001601 KR2009001601W WO2009145435A1 WO 2009145435 A1 WO2009145435 A1 WO 2009145435A1 KR 2009001601 W KR2009001601 W KR 2009001601W WO 2009145435 A1 WO2009145435 A1 WO 2009145435A1
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Prior art keywords
network
address
home network
collision
remote
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PCT/KR2009/001601
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English (en)
Korean (ko)
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조성호
한세희
맹제영
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삼성전자 주식회사
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Priority to EP09754900.0A priority Critical patent/EP2273722B1/fr
Priority to CN200980120058.7A priority patent/CN102047611B/zh
Publication of WO2009145435A1 publication Critical patent/WO2009145435A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2514—Translation of Internet protocol [IP] addresses between local and global IP addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2803—Home automation networks
    • H04L12/2816—Controlling appliance services of a home automation network by calling their functionalities
    • H04L12/2818—Controlling appliance services of a home automation network by calling their functionalities from a device located outside both the home and the home network

Definitions

  • the present invention relates to a UPnP device and a method for resolving a network address conflict in consideration of remote access, and more particularly, even when a network prefix of a home network and a network prefix of a remote network are collided.
  • the present invention relates to a network address conflict resolution method and apparatus for providing a remote access service to a home network.
  • UPnP Universal Plug and Play
  • IP protocol IP protocol
  • UPnP device discovery in accordance with UPnP Device Architecture 1.0 occurs in a distributed and open networking fashion using IP multicast within the home network.
  • the current IP multicast service cannot be guaranteed to be normally performed in the Internet range, as a result, control of the UPnP device using information obtained through UPnP device discovery is not possible through the Internet.
  • the UPnP Remote Access Architecture has been proposed in order to operate as if the UPnP device or Control Point (CP) is physically located away from the home network, as if it were physically present in the same network.
  • the UPnP Remote Access Architecture defines a Remote Access Server (RAS) device in a home network and a Remote Access Client (RAC) device in a remote network.
  • RAS Remote Access Server
  • RAC Remote Access Client
  • FIG. 1 illustrates an environment in which an address conflict exists when there is a remote access connection from a RAC device according to an embodiment of the present invention.
  • FIG. 2 illustrates an environment in which an address conflict exists when there is a remote access connection from a RAS according to another embodiment of the present invention.
  • FIG. 3 illustrates an improved Remote Access Architecture for resolving address conflicts in accordance with one embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a structure of a RAS device of a home network according to an embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating a structure of a RAC device of a remote network according to an embodiment of the present invention and a structure of a RAS device of a remote network according to another embodiment of the present invention.
  • FIG. 6 illustrates a communication sequence for address conflict management between a RAS and a RAC according to an embodiment of the present invention.
  • FIG. 7 illustrates an address translation process of an inbound IP packet from a RAC device of a remote network to a RAS device of a home network according to an embodiment of the present invention.
  • FIG. 8 illustrates an address translation process of an inbound IP packet from a RAS of a remote network to a RAS of a home network according to another embodiment of the present invention.
  • An object of the present invention is to provide an UPnP device and a method for resolving an address conflict between a home network and a remote network and providing a remote access service from the remote network to the home network.
  • an IP packet address translation process causes a collision between a network prefix of a remote network and a network prefix of a home network, so that the UPnP device of the remote network is the same as the UPnP device of the home network.
  • the RAC device can remotely connect to UPnP devices in the home network. Therefore, the RAC device can use the remote access service without changing the address and protocol assigned in the remote network.
  • an IP packet address translation process causes a collision between a network prefix of a remote network and a network prefix of a home network, such that a UPnP device of a remote network is connected with a UPnP device of a home network.
  • the RAS device can remotely access the UPnP device of the home network. Therefore, the RAS can use the remote access service without changing the address and protocol allocated in the remote network.
  • a communication method of a Universal Plug and Play (UPnP) Remote Access Server (RAS) device in a home network includes selecting an address of a virtual home network for remote access that does not conflict with an address of a remote network. ; And translating a network address between an address of the virtual home network for the selected remote access and an address of the home network in packets transmitted and received between the remote network and the home network.
  • UPF Universal Plug and Play
  • RAS Remote Access Server
  • the selecting of the address of the virtual home network for the remote access may include querying whether there is a collision between the address of the virtual home network for the remote access and the address of the remote network that the RAS device is to select. Sending a message to a UPnP device in a remote network; Receiving a collision status response message from a UPnP device in the remote network; And selecting an address of the virtual home network for the remote access according to a result of the collision of the received message.
  • the collision inquiry message preferably includes a network prefix and a network prefix length corresponding to the address of the virtual home network for the remote access.
  • the result of the collision is a collision existence or collision absence.
  • a mapping table entry is generated for an address of the virtual home network for the remote access and an address of the home network allocated to the LAN interface of the RAS device. It is preferable to further comprise the step of.
  • the address of the virtual home network for the remote access is composed of a network prefix and a network prefix length. It is preferable to be.
  • the collision result is a collision existence
  • the collision inquiry message and the collision response message may be generated using an Out of Band Protocol message or an UPnP action message.
  • the step of translating an address of the network may include translating the home network address of a protocol message of an application layer into an address of the virtual home network for the selected remote access; Converting a source address of an outbound IP packet destined for the remote network from the home network to a network prefix corresponding to the address of the virtual home network for the selected remote access; And converting a destination address of an inbound IP packet destined for the home network from the remote network into a network prefix corresponding to the address of the home network assigned to the LAN interface of the RAS.
  • a communication method of a Universal Plug and Play (UPnP) device in a remote network includes: receiving a collision inquiry query message from a RAS; Determining whether there is a conflict between an address of the virtual home network and an address of the remote network for the remote access; And transmitting a collision response message including the determined collision result to the RAS.
  • UFP Universal Plug and Play
  • the determining of the collision may include: a network prefix length corresponding to an address of the virtual home network for the remote access that the RAS wants to select, received as the collision inquiry message; It is preferable to determine whether the network prefixes are the same by comparing the network prefixes by a shorter length among the network prefix lengths corresponding to the addresses of the remote networks.
  • the result of the collision is not present, it is preferable to further include generating a table entry including the address of the virtual home network for remote access of the RAS.
  • the UPnP device of the remote network is preferably a UPnP Remote Acces Client (RAC) device or a UPnP Remote Access Server (RAS) device.
  • RAC UPnP Remote Acces Client
  • RAS UPnP Remote Access Server
  • a computer-readable recording medium having recorded thereon a program for performing the method is included.
  • a Universal Plug and Play (UPnP) Remote Access Server (RAS) device of a home network selects an address of a virtual home network for remote access that does not conflict with an address of a remote network.
  • An address selector of the network And a converting unit converting a network address between an address of the virtual home network for the selected remote access and an address of the home network in packets transmitted and received between the remote network and the home network.
  • a Universal Plug and Play (UPnP) device of a remote network includes a query message receiver for receiving a collision query message from a RAS; A determination unit that determines whether there is a collision between an address of the virtual home network and an address of the remote network for the remote access; And a collision determination response unit configured to transmit a collision response message including the determined collision result to the RAS.
  • URP Universal Plug and Play
  • FIG. 1 illustrates an environment 100 in which an address conflict exists when there is a remote access connection 190 from a RAC device according to an embodiment of the present invention.
  • the network prefix overlapping the network prefix of the home network 130 is used in the remote network 110 on the Internet 120 visited by the RAC device 140 (eg, 192.168.0.x)
  • the remote network ( The UPnP device in the 110 and the UPnP device in the home network 130 may have an address conflict (eg, 150 devices and 180 devices), and thus a problem in that the remote access service may not be provided.
  • FIG. 2 illustrates an environment 200 in which an address conflict exists when there is a remote access connection 290 from a RAS device according to another embodiment of the present invention.
  • FIG. 2 provides a remote access service by connecting the RAS 270 of the home network 230 and the RAS 260 of the remote network 210 using one VPN tunnel.
  • the remote network visited by the RAS uses a network prefix that overlaps with the network prefix of the home network (eg 192.168.0.x)
  • the UPnP device 250 and the home network in the remote network 210 are used.
  • the UPnP device 280 in the 230 may have an address conflict, and thus a problem in that the remote access service may not be provided.
  • FIG. 3 illustrates an improved Remote Access Architecture 300 for addressing address conflicts in accordance with one embodiment of the present invention.
  • the structure of the RAC device and the RAS device shown in FIG. 3 will be described.
  • the address conflict management modules 358 and 388 for solving the collision problem of the network prefix will be described in detail.
  • the remote access server (RAS) device 360 and the home device 390 are UPnP devices existing in the home network, and the remote access client (RAC) device 310 is a remote UPnP device away from the home network.
  • Remote Access Transport Agents (RATs) 355 and 385 provide a secure communication channel between the RAC device 310 and the RAS device 360.
  • RATs Remote Access Transport Agents
  • VPN virtual private network
  • RATA Config is a service provided by RAS and RAC.
  • the management console is a control point with a user interface.
  • the InboundConnectionConfig service 381 provides an interface for the network administrator to configure the settings necessary for the RAC device to establish the RAS device and the RATC.
  • RADA Remote Access Discovery Agent
  • 320, 370 is a device that performs a discovery (Discovery) step in the UPnP network, and synchronizes the network image for the device list found in the home network between the home network and the remote network. Synchronizing the network image means that the devices and services discovered by the RAS device 360 after the discovery step are identical to the devices and services recognized by the RAC device 310.
  • RADA defines logical functional modules called Listener and Relay (321, 382).
  • the RADAListener 382 monitors the SSDP message and provides the RADA 370 with information about it when the device joins or leaves the home network.
  • the RADARelay 321 relays a periodic Simple Service Discovery Protocol (SSDP) announcement message, an expiration message upon device removal, a multicast event message upon image change, and the like to each device in the remote network image to the home network to which it belongs. Perform the function.
  • the RADARelay 321 also responds to SSDP Query (M-Search) of devices in the home network for devices in the remote network.
  • SSDP Simple Service Discovery Protocol
  • the RADA Sync CP 372 of the RAS device 360 uses the AddRemoteDevice () action provided by the RADA Sync service 323 of the RAC device 310 when a new device or service is added to the home network. Synchronize the network image by sending the service to the RAC device 310. The opposite is also true if new devices or services are added to the remote network.
  • the Address Collision Management module (358, 388) of the RAC device and the RAS device prevents collisions between network prefixes of the remote network and the home network through peer to peer communication. .
  • the RAS allocates a home network address for remote access that does not conflict through query / response communication with the RAC. That is, the RAS allocates the address of the virtual home network for remote access so that a collision does not occur.
  • the RAS device then performs the function of translating network addresses for outbound packets destined for the remote network from devices in the home network or inbound packets destined for devices in the home network from the remote network.
  • the address conflict management module 388 of the RAS 400 device includes an address selector 410 and a translator 420 of the virtual home network.
  • the address selector 410 of the virtual home network inquires whether the address of the remote network and the address of the virtual home network for the remote access that the RAS device wants to select collide, and the address of the virtual home network for the remote access that does not conflict. Allocate In detail, the address selector 410 of the virtual home network includes a query message transmitter 411, a response message receiver 412, and a selector 413.
  • the query message transmitter 411 transmits a collision message query message between the address of the virtual home network and the address of the remote network to which the RAS is to be allocated, to the RAC device.
  • the address of the virtual home network for remote access is composed of a network prefix and a network prefix length.
  • the prefix length may vary depending on the size of the home network serviced by the RAS device.
  • the response message receiving unit 412 performs a function of receiving a collision result response message including a collision result corresponding to the collision existence or the collision absence from the RAC device.
  • the conflicting response message received by the query message transmitter 411 and the collision message received by the response message receiver 412 may be generated using an Out of Band Protocol message or a UPnP action message.
  • UPnP action messages may be provided via RADASync services 323 and 371 or other new services.
  • the selector 413 assigns an address of the virtual home network for remote access according to the result of the collision of the received message. If the result of the collision is non-collision, a mapping table entry is created for the address of the virtual home network for remote access of the RAS and the address of the home network allocated to the LAN interface of the RAS. In view of the plurality of remote connections, the mapping table entry may include an identifier for the remote connection, thereby maintaining the mapping table entry for each remote connection.
  • the RAS retries the collision determination request process by retransmitting the collision inquiry query message using the address of the virtual home network for another remote access.
  • the conversion unit 420 converts the network address by using the address of the virtual home network for remote access, which is generated in the mapping table entry.
  • the conversion unit includes an application level gateway (ALG) 421 and an IP packet conversion unit 422.
  • the application level gateway unit 421 converts a home network address of protocol messages of various application layers including a simple service discovery protocol (SSDP) message into an address of a virtual home network for remote access. For example, before sending the SSDP message collected by the RADAListner to the remote network using the RADASyncCP, the RAS device uses the address of the virtual home network for the remote access to allocate the network address portion of the SSDP message for the remote access. Convert to the address of the virtual home network.
  • SSDP simple service discovery protocol
  • the IP packet converter 422 includes an outbound IP packet converter 425 and an inbound IP packet converter 426.
  • the outbound IP packet converter 425 converts the source address of the outbound IP packet destined for the remote network from the home network to a network prefix corresponding to the address of the virtual home network for the selected remote access.
  • the inbound IP packet converter 426 converts a destination address of an inbound IP packet from the remote network to the home network into a network prefix corresponding to the address of the home network assigned to the LAN interface of the RAS.
  • the address conflict management module of the RAC device or the RAS 500 of the remote network includes a collision determination response unit 510.
  • the collision determination response unit 510 includes a query message receiver 511, a determination unit 512, and a response message transmitter 513.
  • the query message receiving unit 511 performs a function of receiving a collision query message from the RAS.
  • the collision inquiry message includes a network prefix and a network prefix length corresponding to an address of a virtual home network for remote access serviced by the RAS device.
  • the determination unit 512 compares the network prefixes by a shorter length of the network prefix length corresponding to the address of the virtual home network for the remote access and the network prefix length corresponding to the remote network address, and determines whether the same is the same. Perform the function.
  • the response message transmitter 513 transmits the collision response message including the determined collision result to the RAS.
  • the conflicting response message received by the query message receiving unit 511 and the conflicting response message received by the response message transmitting unit 513 may be generated using an Out of Band Protocol message or a UPnP action message.
  • UPnP action messages may be provided via RADASync services 323 and 371 or other new services.
  • the RAC device can manage address conflicts for a plurality of home networks by maintaining an address of a virtual home network for remote access allowed to the RAS because there is no collision.
  • the RAC device may further include a table entry generating unit for generating a table entry including an address of a virtual home network for remote access allowed to the RAS when the collision result is not present in the collision.
  • the query message transmitting unit 411 of the RAS 620 transmits a query message 631 between the virtual home network address and the remote network address for the remote access that the RAS wants to select to the RAC device 610. .
  • the RAC determines whether or not there is a collision, and transmits a collision response message 633 including a collision result corresponding to the collision existence or the collision absence to the RAS.
  • the response message receiving unit 412 of the RAS receives this, and the allocation unit 413 receives a collision result if the collision result does not exist (636), the address of the virtual home network for remote access of the RAS and the LAN interface of the RAS.
  • a mapping table entry for the address of the home network allocated to the network is created. If the result of the collision is a collision existence (635), the RAS device retries the collision determination request process by retransmitting the collision query message using the address of the virtual home network for another remote access.
  • the collision request message and the collision request message may be generated using an Out of Band Protocol message or a UPnP action message.
  • UPnP action messages may be provided via RADASync services 323 and 371 or other new services.
  • FIG. 7 illustrates an address translation process of an inbound IP packet from a RAC device of a remote network to a RAS device of a home network according to an embodiment of the present invention. Since the RAC device receives the SSDP message including the address of the virtual home network for remote access from the RAS, the RAC device remotely accesses the device in the home network using the address having the 10.66.1.x prefix.
  • an IP address change process of the inbound IP packet header will be described.
  • a packet is generated (761) with a source address of 10.66.0.10 (the endpoint on the RAC device side of the VPN tunnel) and a source address of 10.66.1.3.
  • This packet is a VPN packet by RA Transport Agent. In tunneling mode, IP-in-IP encapsulation is performed so that an IP packet header having a source address of 10.66.0.10 and a destination address of 10.66.0.1 is added. (762)
  • This packet is transmitted and (3) the received RAS ends the VPN tunneling by stripping the outer header of the packet (763) (4) changing the IP packet header with the destination address 10.66.1.3 to 192.168.0.3
  • the data is sent to the server.
  • a device inside the home network sends a packet to a RAC device (not shown), (1) it generates an IP packet with a source address of 10.66.0.10 and a source address of 192.168.0.x, which is then sent to the RAS device. Receives using proxy ARP. (2) In the received packet, the source address of 192.168.0.x is converted into 10.66.1.x and IP-in-IP encapsulated, so that the IP packet of source address of 10.66.0.1 and source address of 10.66.0.10 It will add a header. (3) The transmitted packet is received by the RAC device, and the VPN header is removed. (4) The packet is received because it is the receiver.
  • the network prefix of the home network and the network prefix of the home network collide with each other through the conversion process (eg 192.168.0.x), so that the UPnP device of the remote network is homed.
  • the RAC device can remotely connect to the UPnP device of the home network. Therefore, the RAC device can use the remote access service without changing the address and protocol assigned in the remote network.
  • FIG. 8 illustrates an address translation process of an inbound IP packet from a RAS of a remote network to a RAS of a home network according to another embodiment of the present invention.
  • 8 illustrates a scenario in which a remote access service is provided by connecting a home network and a remote network to each RAS device using one VPN tunnel. In this case, two pairs of collision determination processes are required.
  • one RAS device includes a collision determination request unit 410 and a conversion unit 420, and the other RAS device determines the collision.
  • the response unit 510 is included.
  • a peer RAS device communicating with a RAS device of a home network is described as a RAS device of a remote network.
  • FIG. 8 shows the results 830 and 860 of the collision determination request unit 410 between the RAS and the RAS of the remote network selecting the addresses of the virtual home networks for the remote access that do not collide with each other. That is, since the RAS 880 of the remote network will recognize the address of the network serviced by the RAS 890 of the home network as 10.66.0.x, the address of the network to which it belongs is 192.168.0.x (820). It was determined that no collision occurred. The opposite is also true.
  • the UPnP device serviced by the RAS of the remote network has a 10.66.0.x prefix.
  • Remote access to a device on the home network using an address with Hereinafter, an IP address change process of the inbound IP packet header will be described.
  • RAS of remote network receives the packet of source address 192.168.0.5 and source address 10.66.0.3 from device of remote network by using proxy ARP (871). Convert to the 10.66.0.x prefix (eg 10.66.0.5).
  • This packet is a VPN packet by RA Transport Agent. In tunneling mode, IP-in-IP encapsulation is performed so that an IP packet header having a source address of 10.66.0.10 and a destination address of 10.66.0.1 is added. (872).
  • This packet is transmitted and (3) the received home RAS finishes VPN tunneling by stripping the outer header of this packet (873) (4) changing the IP packet header with the destination address 10.66.0.3 to 192.168.0.3 Send to the network (874).
  • a device served by a home RAS device transmits a packet to a device served by a RAS device of a remote network (not shown) is the same.
  • the network prefix of the remote network and the network prefix of the home network collide with each other (e.g., 192.168.0.x). Even if the home network has the same IP address as the UPnP device of the home network, the RAS can remotely access the UPnP device of the home network. Therefore, the RAS can use the remote access service without changing the address and protocol allocated in the remote network.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention concerne un dispositif UPnP (universal Plug and Play) permettant d'empêcher un conflit d'adresses réseau en cas d'accès à distance et un procédé correspondant. Un procédé de communication du dispositif serveur d'accès à distance (RAS) UPnP du réseau domestique selon la présente invention consiste à sélectionner une adresse d'un réseau domestique virtuel pour un accès à distance qui ne puisse pas entrer en conflit avec l'adresse d'un réseau à distance puis à exécuter une traduction d'adresses réseau mutuelle entre l'adresse sélectionnée du réseau domestique virtuel pour l'accès à distance et l'adresse du réseau domestique dans un paquet transmis/reçu entre le réseau à distance et le réseau domestique.
PCT/KR2009/001601 2008-03-31 2009-03-30 Dispositif upnp permettant d'empêcher un conflit d'adresses réseau en cas d'accès à distance et procédé correspondant WO2009145435A1 (fr)

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Application Number Priority Date Filing Date Title
EP09754900.0A EP2273722B1 (fr) 2008-03-31 2009-03-30 Dispositif upnp permettant d'empêcher un conflit d'adresses réseau en cas d'accès à distance et procédé correspondant
CN200980120058.7A CN102047611B (zh) 2008-03-31 2009-03-30 考虑远程访问解决网络地址冲突的通用即插即用设备和方法

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US4078408P 2008-03-31 2008-03-31
US61/040,784 2008-03-31
KR10-2008-0085910 2008-09-01
KR1020080085910A KR101499551B1 (ko) 2008-03-31 2008-09-01 원격 접속을 고려하여 네트워크 주소 충돌을 해결하는 ＵＰｎＰ 장치 및 그 방법

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US20090245266A1 (en) 2009-10-01
EP2273722A1 (fr) 2011-01-12
KR20090104624A (ko) 2009-10-06
CN102047611A (zh) 2011-05-04
EP2273722B1 (fr) 2017-04-26
CN102047611B (zh) 2014-07-09

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